org.apache.pig.piggybank.evaluation.math
Class FloatSignum

java.lang.Object
  extended by org.apache.pig.EvalFunc<Float>
      extended by org.apache.pig.piggybank.evaluation.math.FloatSignum

public class FloatSignum
extends EvalFunc<Float>

math.SIGNUM implements a binding to the Java function Math.signum(float). Given a single data atom it Returns the signum function of the argument.

Parameters:
value - Float.
Return Value:
Float
Return Schema:
SIGNUM_inputSchema
Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.SIGNUM(float1);

Author:
ajay garg
See Also:
Math.signum(float),

Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
log, pigLogger, reporter, returnType
 
Constructor Summary
FloatSignum()
           
 
Method Summary
 Float exec(Tuple input)
          java level API
 Schema outputSchema(Schema input)
          Report the schema of the output of this UDF.
 
Methods inherited from class org.apache.pig.EvalFunc
finish, getArgToFuncMapping, getCacheFiles, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setPigLogger, setReporter, warn
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FloatSignum

public FloatSignum()
Method Detail

exec

public Float exec(Tuple input)
           throws IOException
java level API

Specified by:
exec in class EvalFunc<Float>
Parameters:
input - expects a single numeric value
output - returns a single numeric value, signum function of the argument
Returns:
result, of type T.
Throws:
IOException

outputSchema

public Schema outputSchema(Schema input)
Description copied from class: EvalFunc
Report the schema of the output of this UDF. Pig will make use of this in error checking, optimization, and planning. The schema of input data to this UDF is provided.

Overrides:
outputSchema in class EvalFunc<Float>
Parameters:
input - Schema of the input
Returns:
Schema of the output


Copyright © 2007-2012 The Apache Software Foundation